One I've heard on occasion to mean not feeling well is when someone feels like "a bag of smashed assholes".
When people are goofing around, doing stuff just for the heck of it, I have heard it stated as "shits and giggles", as in "Do you think I banged my head just for shits and giggles!"
someone who's acting like a jerk may be called a "wanker."
My boss, who is a great guy, definitely full of "piss and vinegar," always has the same comment when anyone (a) says or does something stupid or (b) is clueless. "Yuh numbnutz."
Our standard response is "Bite me, Jay."
Heh heh. I love my job.
I am a poor, wayfaring stranger
Wandering through this world of woe
But there's no sickness, no fear or danger
In that bright land
To which I go